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Window Installation Awards & Badges
  • Ours was a very small project of 3 basement windows. We were pleased with the excellent communication and updates about the status of our pr... read more - Mark D. - 10/15/2019 

  • Great work! They handled replacing some unusually sized doors and were extremely professional and helpful in making decisions. - Amanda B. - 9/12/2019 

  • Great experience. Beautiful new windows. Crew installed in one day. Customer service was also great. - Jill L. - 9/12/2019 

  • On time professional, friendly. Cleaned up after themselves, courteous. Several of my neighbors have used them as well, and I wouldn’t hesi... read more - Sheila H. - 7/31/2019 

  • I had another quote from a competing window company and Lake Washington Windows had a better price. The competing window company had the s... read more - Salmon K. - 6/18/2019 

Sumner Window Replacement

When considering window replacement, Sumner residents should spend a little extra time in making sure they find the right company – both for the product and for services. This is because Sumner, being a small city, doesn’t have the options a place like Federal Way or Tacoma does. So you need to make sure you do your research and find the right company instead of settling for the option closest to you.

Lake Washington Windows and Doors has offices in Seattle and Renton. It’s a 45-minute drive, but we promise it’s worth it. We do window installation in Sumner (and nearby areas), and also provide glass replacement services (for all types except wooden windows). We sell products by two main companies, Milgard and Andersen. 

Milgard Vs Andersen Windows


Founded in Tacoma in 1958, Milgard is a trusted company with excellent products. Their windows are very suited to the local climate, and come with a lifetime warranty. 

Milgard has received various awards and honors from:

  • Builder Magazine
  • Houzz
  • MetrixLab
  • Remodeling Magazine

In 2019 Milgard was recognized as the company with the ‘Best Quality Vinyl Window’ by Builder Magazine, and also awarded the ‘Most Used & Most Recognized Window Brand’ award.

Their lifetime warranty covers any defects in material or workmanship. So if you discover one, no matter how much time has passed, Milgard will replace the damaged parts for free and arrange for free reinstallation. Milgard cares about its customers. 


Andersen Corporation is the largest window and door manufacturer in North America, with $2.5 billion in sales in 2016. Andersen Windows is a subsidiary of the Andersen Corporation, and is among the six largest window manufacturers nationwide.

Andersen Windows focuses on sustainability, beauty, community and service. Another great thing about Andersen Windows is their Owner-2-Owner material and labor warranty, which protects the consumer.

Lake Washington Windows is a certified dealer of Andersen Windows. We have many different window options at our store – from materials to styles. If you’re unsure what you want, we’ll go over your needs and help you choose the right product. We also do window installation in Sumner, so you can get everything done at once.

Benefits Of Window Replacement

When you replace damaged windows, you aren’t just cleaning up your home’s look. You’re investing in an asset which will pay for itself over time. Here are some of the benefits of getting new windows:

Improved security 

Our windows have been tested for forced-entry by an independent national organization, so you can sleep easy knowing your home is safe once the doors and windows are locked. In addition, many of our products come with multiple-point locking systems that make breaking the lock nearly impossible.

A Quieter Home 

Modern windows reduce the amount of noise that gets into your home. They aren’t sound-proof, but the superior build and seal help muffle sound so your home feels nice and quiet.

Energy Efficiency 

Old windows are responsible for inflated energy bills, because warped or damaged windows don’t provide good insulation. High-quality windows from our window and door company in Sumner will provide much better insulation, thus reducing heating and cooling costs and enabling you to use less energy.

Why Choose Lake Washington Windows?

Also known as Lake Washington Windows and Doors, the company was established sixteen years ago, and has rapidly grown in size owing to its unique philosophy and excellent service. 

We constantly strive to learn more and do better, and are dedicated to serving our customers. Our goal is to provide the best possible service, and to pursue excellence in all aspects of life. We aim to build lasting business relationships, and our service quality reflects that.

If you’re looking for a Sumner window replacement company that takes the time to get things right, come visit us at our Renton office. For any questions, call us at (425) 255-2600.

Free Replacement Estimate

Start saving energy, lower your heating bill, and improve the appearance of your home. Call the Certified Window and Door Replacement Specialists at Lake Washington Windows at (425) 255-2600 for a Free Estimate! We offer financing and payment plans too.

  • Free In-Home Estimate

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2019 Best of Bellevue Award
Best Window companies in Seattle
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